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Effect of Vortex Design on a Half-Ducted Axial Flow Fan (In the case of forced vortex design)
Kaji, Atsushi,Kinoue, Yoichi,Shiomi, Norimasa,Setoguchi, Toshiaki Korean Society for Fluid machinery 2018 International journal of fluid machinery and syste Vol.11 No.1
An improvement of the half-ducted axial flow fan design by applying the forced vortex design to the rotor blade was conducted by CFD. The quasi three-dimensional flow theory was applied for the half-ducted fan design, and the meridional flow was calculated by the method of streamline curvature. When the radial balance equations from hub to tip was solved, the vortex design was changed from the constant-whirl-velocity design to the forced vortex design in reference to our previous experimental results of the half-ducted fan's internal flow. The analysis of the three-dimensional internal flow fields of the half-ducted fan designed by adopting the forced vortex design was conducted. As a result of CFD, the efficiency ${\eta}$ of the fan was about 1-3 % larger at the flow rate coefficient ${\phi}$ of 0.158-0.343 than the constant-whirl-velocity design.
Development of Heat- and Creep-resistant Fine-grained Rapidly Solidified P/M Aluminum Alloy
Kaji Toshihiko,Tokuoka Terukazu,Nishioka Takao 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
The new alloy1) is made from rapidly solidified Al-Ni-Zr-Ce aluminum alloy powder, and has the following unique mechanical characteristics:(1) The stress-strain curve shows a yield point; (2) The alloy shows high heat resistance; (3) Although the alloy is submicron particle diameter, it shows excellent creep resistance. We observed the micro structures of this new alloy, and it is thought that is based on the following reasons:(1) The dislocation strongly adheres to the alloy’s many crystal boundaries;(2) The added alloying elements have a small diffusion coefficient in aluminum;(3) The tiny intermetallic compound particles crystallizing at the grain boundary.
pLog: User Generated Media for Personal LBS
Kaji, Hideki,Arikawa, Masatoshi Korea Spatial Information System Society 2009 한국공간정보시스템학회 논문지 Vol.11 No.2
This paper proposes a framework for personal location based services with personal life content, for example diaries, schedules and to-do lists. A lot of Internet users are recording their personal experiences and knowledge as text and other digital media on the network. Our proposed tool provides users with an environment to store personal records with related place attributes, and to retrieve these personal records at the right place. There are two applications on this tool, a place-enhanced blog and a LBS client on a mobile phone. The place enhanced blog provides users with blog interfaces for inputting place information. The place rem inder is a browser for spatial data on the place enhanced blog. Users can generate place information by writing personal records on their blog. Furthermore, using the LBS client, other users can retrieve personal records at the appropriate spots.
The Re-Launch of Lisbon: A Wake-up Call to Citizens
( Sahoko Kaji ) 한국EU학회 2007 Asia-Pacific Journal of EU Studies Vol.5 No.1
In order for the re-launch of Lisbon to succeed, it is not enough to increase the ``sense of ownership`` on the part of Member State policy authorities. The ``sense of ownership`` must also increase on the part of Member State citizens. This is because the changes must be (1) on the ground and (2) long term. Policies related to Lisbon are subject to the principle of subsidiarity and the Open Method of Co-ordination, and rightly so. Further, Lisbon is not a question of cyclical recovery but long-term structural improvement. EU citizens must recognise the responsibilities they have in attaining the Lisbon goals. And in as much as citizens in some Member States do so more than in others, the relative success of the re-launch will vary across the EU.
Label Prediction of the Unlabeled Mood of a Music Genre Using Semi-Supervised Learning
Babu Kaji Baniya,이준환 차세대컨버전스정보서비스학회 2015 차세대컨버전스정보서비스기술논문지 Vol.4 No.2
Music genre and mood classifications are vital components of the field of multimedia retrieval and computational musicology. There is a growing interest in their development to address the difficulties of music categorization. The proposed method finds the unlabeled mood of a music genre with the help of labeled music mood datasets using different audio feature sets. Semi-supervised learning, which exploits huge amounts of unlabeled data, together with the limited labeled data for learning, has attracted a great deal of research interests. In this paper, we propose diverse audio features to precisely characterize music content. The feature sets belong to four groups: dynamic, rhythmic, spectral, and harmonic. A bin histogram was calculated from each feature to preserve all the important information associated with it. From the extracted audio features, we first tried to find the unlabeled mood of a music genre by using the labeled mood dataset. Harmonic and consistency (local and global) semi-supervised learning algorithms were considered to determine the unknown mood label of a music genre. In the next stage, we also evaluated whether unlabeled genre datasets would influence the mood classification accuracy. The unlabeled datasets were added to the training set in different proportions, so that the overall impact on classification accuracy could be analyzed. We improved the classification accuracy using an unlabeled music genre dataset in training. In the last section, we verified the classification accuracy by adding an unlabeled genre dataset to label mood with only the mood dataset (without adding a genre dataset).
Ram Kaji Budhathoki,Maheshwar Pd. Sah,김주홍(Juhong Kim),김형석(Hyongsuk Kim) 大韓電子工學會 2012 電子工學會論文誌-SD (Semiconductor and devices) Vol.49 No.5
저항, 콘덴서, 및 인턱터와 함께 4의 회로 소자로 알려진 멤리스터가 개발되었으나, 아직 그 전기적 특성이 충분히 해석되지 않고 있다. 멤리스터들은 연결된 극성에 따라서 저항이 증가 혹은 감소하며, 직렬 혹은 병렬연결 형태에 따라서 그 동작 특성이 다양해진다. 본 연구에서는 HP의 TiO2 멤리스터를 모델로 하여 다양한 직 병렬회로에 대한 전기적 특성을 분석하였다. 이를 위해서 사인파 입력신호에 대해서 나타나는 전압-전류 간의 히스테르시스 루프의 다양한 모양을 분석하였다. 본 멤리스터 연구결과는 멤리스터 소자에 대한 특성 이해와 논리 회로 및 뉴런 셀에의 응용회로들의 특성을 분석하는데 유용하게 사용될 수 있다. Memristor which is known as fourth basic circuit element has been developed recently but its electrical characteristics are not still fully understood. Memristor has the incremental and decremental feature of the resistance depending upon the connected polarities. Also, its operational behavior become diverse depending on its connection topologies. In this work, electrical characteristics of diverse types of serial and parallel connections are investigated using the HP TiO2 model. The characteristics are analyzed with pinched hystersis loops on the V-I plane when sine input signal is applied. The results of the work would be utilized usefully for analyzing the characteristics of memristor element and applications to logic circuit and neuron cells.